fork download
copy 
  1. #include<bits/stdc++.h>
  2.  
  3. #define ll long long
  4. #define pp push_back
  5. #define endl '\n'
  6. #define all(x) x.begin(),x.end()
  7. #define ld long double
  8. #define PI acos(-1)
  9. #define ones(x) __builtin_popcountll(x)
  10. //#define int ll
  11.  
  12. using namespace std;
  13.  
  14. void Drakon() {
  15.     ios_base::sync_with_stdio(false);
  16.     cin.tie(nullptr);
  17.     cout.tie(nullptr);
  18. #ifdef Clion
  19.     freopen("input.txt", "r", stdin), freopen("output.txt", "w", stdout);
  20. #endif
  21. }
  22.  
  23. unsigned long long inf = 1e10;
  24. const double EPS = 1e-6;
  25. const int MOD = 1000000007, N = 1e6 + 5, LOG = 25;
  26.  
  27. ll mul(const ll &a, const ll &b) {
  28.     return (a % MOD + MOD) * (b % MOD + MOD) % MOD;
  29. }
  30.  
  31. ll add(const ll &a, const ll &b) {
  32.     return (a + b + 2 * MOD) % MOD;
  33. }
  34.  
  35. ll pw(ll x, ll y) {
  36.     ll ret = 1;
  37.     while (y > 0) {
  38.         if (y % 2 == 0) {
  39.             x = mul(x, x);
  40.             y = y / 2;
  41.         } else {
  42.             ret = mul(ret, x);
  43.             y = y - 1;
  44.         }
  45.     }
  46.     return ret;
  47. }
  48.  
  49. int n, freq[(1 << 20)], dp[20][(1 << 20)];
  50.  
  51. int slv(int bit, int subMask) {
  52.     if(bit == -1) {
  53.         return freq[subMask];
  54.     }
  55.     int &ret = dp[bit][subMask];
  56.     if(~ret)
  57.         return ret;
  58.     ret = slv(bit - 1, subMask);
  59.     if((1 << bit) & subMask) ret += slv(bit - 1, subMask ^ (1 << bit));
  60.     return ret;
  61. }
  62.  
  63. void solve() {
  64.     cin >> n;
  65.     vector<int> vec(n);
  66.     for (int i = 0; i < n; ++i) {
  67.         cin >> vec[i];
  68.         freq[vec[i]] ++;
  69.     }
  70.  
  71.     memset(dp, -1, sizeof dp);
  72.     ll ans = 0;
  73.     for (int i = 0; i < n; ++i) {
  74.         int subMask = ~vec[i];
  75.         subMask &= (1 << 20) - 1;
  76.         ans += slv(19, subMask);
  77.     }
  78.     cout << ans / 2 << endl;
  79. }
  80.  
  81. signed main() {
  82.     Drakon();
  83.     int t = 1;
  84.     //cin >> t;
  85.     while (t--) {
  86.         solve();
  87.     }
  88. }
Success #stdin #stdout 0.02s 86216KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
0
https://ideone.com/1k3JMB
language:
C++14 (gcc 8.3)
created:
3 days ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!